25243613 has 4 divisors (see below), whose sum is σ = 25273728. Its totient is φ = 25213500.

The previous prime is 25243607. The next prime is 25243633. The reversal of 25243613 is 31634252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25243613 - 2⁴ = 25243597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25243633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13763 + ... + 15488.

It is an arithmetic number, because the mean of its divisors is an integer number (6318432).

Almost surely, 2^25243613 is an apocalyptic number.

It is an amenable number.

25243613 is a deficient number, since it is larger than the sum of its proper divisors (30115).

25243613 is an equidigital number, since it uses as much as digits as its factorization.

25243613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30114.

The product of its digits is 4320, while the sum is 26.

The square root of 25243613 is about 5024.3022401126. The cubic root of 25243613 is about 293.3484770361.

Adding to 25243613 its reverse (31634252), we get a palindrome (56877865).

The spelling of 25243613 in words is "twenty-five million, two hundred forty-three thousand, six hundred thirteen".